CN102305450B - Method for increasing seasonal energy efficiency ratio of air conditioner and frequency conversion control system - Google Patents
Method for increasing seasonal energy efficiency ratio of air conditioner and frequency conversion control system Download PDFInfo
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- CN102305450B CN102305450B CN2011101897966A CN201110189796A CN102305450B CN 102305450 B CN102305450 B CN 102305450B CN 2011101897966 A CN2011101897966 A CN 2011101897966A CN 201110189796 A CN201110189796 A CN 201110189796A CN 102305450 B CN102305450 B CN 102305450B
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Abstract
The invention provides a method for increasing the seasonal energy efficiency ratio of a Freon-free direct current frequency conversion air conditioner. When the air conditioner is in a rated medium refrigerating mode, an outdoor mainboard microcomputer chip controls a frequency conversion module according to the detected and calculated rotor rotation position of a compressor to compensate the dynamic torque of the compressor, and controls the frequency conversion module according to the detected and calculated comparison result of the operating frequency of the compressor with a target frequency so as to increase the accuracy of the operating frequency of the compressor; and when the air conditioner is in a rated refrigerating mode, the outdoor mainboard microcomputer chip controls an IGBT (Insulated Gate Bipolar Transistor) in the frequency conversion module to be shut down so as to cut out the PFC (Power Factor Correction) control of a frequency conversion power supply of the air conditioner. The invention also provides a frequency conversion control system of the a Freon-free direct current frequency conversion air conditioner, which has an outdoor mainboard microcomputer chip comprising a module for cutting out PFC control, a torque compensating module, and a module for increasing the operating frequency accuracy of the compressor. The invention can maximize the seasonal energy efficiency ratio of the Freon-free direct current frequency conversion air conditioner.
Description
Technical field
The present invention relates to a kind of method of refrigeration energy resource consumption in the season efficiency that improves air-conditioner and the frequency-changing control system of Freon-free DC inverter air conditioner.
Background technology
During the existing specified refrigeration project testing of frequency changer, capillary pipe length is determined and is partial to meet specified refrigeration requirement, SEER (refrigeration energy resource consumption in season efficiency) result of calculation is determined jointly by specified refrigeration and specified middle refrigeration, while testing specified middle refrigeration, the compressor operating frequency is low, refrigerant flow rate is slow, refrigerant flows through take the capillary that specified refrigeration is standard and carries out the step-down throttling, enter evaporimeter with higher evaporating temperature, heat transfer temperature difference diminishes like this, the refrigerating capacity deficiency.Existing automatically controlled to the compressor low frequency running control the method that adopts according to load moment adjustment to apply torque-variable, can increase like this power consumption of machine, do not meet the trend of current air-conditioning technical energy-saving.The at present unlatching of PFC is that the size by the complete machine electric current determines, and the complete machine electric current during lower than the firing current standard PFC still in opening, increased the power consumption of machine.The precision that the press running frequency is controlled at present general outer automatically controlled detection is 1Hz.
Summary of the invention
For the problem existed in correlation technique, the object of the present invention is to provide a kind of method of refrigeration energy resource consumption in the season efficiency that improves air-conditioner and the frequency-changing control system of Freon-free DC inverter air conditioner, farthest to improve refrigeration energy resource consumption in the season efficiency of air-conditioner.
For achieving the above object, one aspect of the present invention provides a kind of method that improves refrigeration energy resource consumption in the season efficiency of air-conditioner, this air-conditioner is Freon-free DC inverter air conditioner, at air-conditioner in the middle of specified during refrigeration mode, the outdoor mainboard microcomputer chip of air-conditioner, the rotor running position of the compressor gone out according to detection computations, the frequency-variable module of control air-conditioner compensates the dynamic torque of compressor, and the comparative result of the running frequency of the compressor gone out according to detection computations and target frequency, control the precision of frequency-variable module with the running frequency of raising compressor, and during in specified refrigeration mode, by the outdoor mainboard microcomputer chip of air-conditioner, close the IGBT in frequency-variable module at air-conditioner, with the PFC turned off for the variable-frequency power sources of air-conditioner, control.
Preferably, during refrigeration mode, can also turn off as mentioned above PFC and control in the middle of specified at air-conditioner.
Preferably, the described dynamic torque to compressor compensates, comprise: outdoor mainboard microcomputer chip calculates the operation phase current state of the compressor of feedback the rotor running position of compressor, and input the pwm signal with the position correction coefficient to frequency-variable module, thereby the dynamic torque of compensation compressor.
Preferably, the precision of the running frequency of the described compressor of described raising, comprise: outdoor mainboard microcomputer chip calculates the cyclically-varying frequency of the operation phase current of the compressor of feedback and predetermined frequency values relatively, with the running frequency that judges compressor and the difference of target frequency, whether meets required precision; And, when the difference of the running frequency of compressor and target frequency does not meet the demands, change cycle and size of three-phase current of direct current generator of the drive compression machine of frequency-variable module output, thereby the running frequency that changes compressor is to meet required precision.
Preferably, air-conditioner be take capillary as restricting element, and inside diameter capillaceous is 1.4mm, and length is to be selected to be more than or equal to 550mm and to be less than or equal to the arbitrary numerical value in the 650mm scope.
Preferably, inside diameter capillaceous is 1.4mm, and length is 580mm.
On the other hand, the present invention also provides a kind of frequency-changing control system of Freon-free DC inverter air conditioner, there is outdoor mainboard microcomputer chip, outdoor mainboard microcomputer chip comprises: turn-off the module that PFC controls: air-conditioner in specified refrigeration or specified in the middle of during refrigeration mode, by the IGBT in the frequency-variable module of turning off air-conditioner, to turn-off the PFC control for the variable-frequency power sources of air-conditioner; The compensated torque module: at air-conditioner in the middle of specified during refrigeration mode, outdoor mainboard microcomputer chip calculates the rotor running position of compressor according to the operation phase current state of the described compressor of feedback, and input the pwm signal with the position correction coefficient to described frequency-variable module, with the dynamic torque of compensation compressor; Improve the module of compressor operating frequency accuracy: at air-conditioner in the middle of specified during refrigeration mode, when the difference of the running frequency of compressor and target frequency does not meet required precision, the cycle and size of the three-phase current of the direct current generator of the drive compression machine of change frequency-variable module output, thus the running frequency of change compressor is to meet required precision.
Than prior art, beneficial effect of the present invention is:
By the scheme to the capillary group, improve, control with the PFC switch and control by external automatically controlled compensated torque, the optimization of the schemes such as raising compressor operating frequency accuracy control, the consumed power of reduction air-conditioner, promote the refrigerating capacity of air-conditioner, thereby improve the SEER value of Freon-free DC inverter air conditioner;
Further, method of the present invention and frequency-changing control system make the performance of Freon-free DC inverter air conditioner be improved, can meet with optimum system the GB requirement, not only make automatically controlled control more intelligent, and reduced the consumed power of air-conditioner, reduce raw-material use, the improving product market competitiveness.
The accompanying drawing explanation
Fig. 1 schematically shows the theory diagram that improves the compressor operating frequency accuracy.
The specific embodiment
The method of refrigeration energy resource consumption in the season efficiency of raising Freon-free DC inverter air conditioner of the present invention comprises:
(1), for the capillary that is used as restricting element in air-conditioner, lengthen its length to improve the value of SEER
For the Freon-free DC inverter air conditioner that uses capillary as restricting element, the selection of capillary specification is to its system stable operation and performance guarantee important.The cardinal principle of supercooling tube group coupling is, requires in situation meeting specified refrigeration, make capillary pipe length meet to the full extent specified in the middle of refrigeration to the requirement of system cold medium flux and throttle.
Current domestic nominal refrigerating capacity is tri-grades of floride-free DC frequency-changing machines of 3500W, and according to great many of experiments contrast test checking, during refrigeration, between 550mm-650mm, when (inside diameter is 1.4mm), the SEER of transducer air conditioning is improved the capillary specification.
Take the capillary specification as the comparative example of 2.7*1.4*550 before improving, take the capillary specification as of the present invention example of capillary specification 2.7*1.4*580 after improving, according to following experiment condition, obtain and calculate the experimental data under refrigeration mode shown in following table 1, specified and specified middle refrigeration mode.
Wherein, the declared working condition under the T1 weather that experiment model is the GB/T7725-2004 regulation: Indoor Dry wet-bulb temperature: 27 ℃/19 ℃; Outdoor dry bulb and wet bulb: 35 ℃/24 ℃.Laboratory: enthalpy difference laboratory.The experiment machine: Haier's nominal refrigerating capacity is tri-grades of floride-free DC frequency-changing machines of 3500W.
Table 1
Each meaning of parameters in table 1: ability (W): be in the effective storage life of each temperature range, air-conditioner refrigerating capacity sum; Power (W): be in the effective storage life of each temperature range, the air-conditioner refrigeration consumes the power consumption sum; EER (W/W): be the coefficient of performance of refrigerating of air-conditioner, also claim Energy Efficiency Ratio, mean the unit power refrigerating capacity of air-conditioner; SEER (W/W): refrigeration energy resource consumption in season efficiency; Capillary specification: overall diameter * interior diameter * length, for example 2.7*1.4*550 means: outer dia is that 2.7mm, inside diameter are that 1.4mm, length are 550mm, and 2.7*1.4*580 means: outer dia is that 2.7mm, inside diameter are that 1.4mm, length are 580mm.
From the experimental data of table 1, by adding long capillary, SEER improves 0.08W/W.
(2) carry out compensated torque when specified middle refrigeration mode
In Freon-free DC inverter air conditioner, the course of work of compressor by air-breathing->compression->exhaust->air-breathing cyclic process forms, and be unequal at the stressed of each stage rotor, particularly more outstanding at this force unbalance that is subject to of single-rotor compressor.When non-moment is controlled, especially during low frequency, the moment that may apply when compressor load is large is on the contrary little, and the moment that load hour may apply is large on the contrary, and the vibrations that show as compressor are large.If adjustment applies moment according to load moment fully, can increase the power consumption of machine.
The large characteristics of vibration of compressor while turning round based on low frequency, the present invention, compensates the dynamic torque of compressor in the middle of specified during refrigeration mode at air-conditioner.Particularly, the rotor running position that outdoor mainboard microcomputer chip calculates compressor according to the operation phase current state of compressor of feedback (, the run location of compressor), and input the pwm signal with the position correction coefficient to frequency-variable module, thereby the dynamic torque of compensation compressor, make compressor smooth operation constantly.Adopt above-mentioned compensated torque, can keep the dynamic torque value (that is, constant moment of force control) corresponding certain in each detection position of compressor, can reduce low-frequency vibration and reduce again wasted work, the SEER of transducer air conditioning further is improved.
Take without compensated torque as improving front comparative example, take of the present invention example of compensated torque after improving arranged, under the situation of 2.7*1.4*580 in the capillary specification is all elected table 1 as, and tested under the experiment condition identical with table 1, obtained the data as following table 2:
Table 2
From the experimental data of table 2, increase compensated torque control by testing when freeze in specified centre, SEER improves 0.02W/W.
(3) turn-offing PFC controls
The variable-frequency power sources of Freon-free DC inverter air conditioner, by the control of PFC, can guarantee that supplying with compressor voltage is high voltage, can make the compressor operating high frequency like this.In order further to improve the value of SEER, the present invention, under specified refrigeration mode or specified middle refrigeration mode, turn-offs PFC and controls.
Particularly, outdoor mainboard microcomputer chip is processed judgement after receiving indoor automatically controlled mainboard signal, when if signal is specified refrigeration or specified middle refrigeration mode, outdoor mainboard microcomputer chip drives the IGBT of reactor to send the constant pwm signal of state in IPM, IGBT is not worked, thereby close PFC, control, the PFC that has closed the variable-frequency power sources of air-conditioner controls; If, when signal is not specified refrigeration and specified middle refrigeration mode, outdoor mainboard microcomputer chip sends to the IGBT that drives reactor the signal that the period of state rule changes, make IGBT drive reactor work.
Specified refrigeration and specified in the middle of during refrigeration mode, the compressor operating frequency be in and low frequency, can guarantee supply compressor voltage operational objective frequency turning off when PFC controls.Because frequency-variable module (that is, drives the IGBT of reactor not work in IPM), therefore this element wasted work not; Because reactor is electrical part, this generates heat and consumed power when operation, so turn off PFC control, can make the air-conditioner system consumed power reduce, improving performance.
Take " opening PFC " as improving front comparative example, " turn-offing PFC " is the example of the present invention after improving, under the situation of 2.7*1.4*580 in the capillary specification is all elected table 1 as, and all adopt under the situation of compensated torque under specified middle refrigeration mode, tested under experiment condition based on identical with table 1, can be obtained the data as following table 3.
Table 3
From the experimental data of table 3, by turning off PFC, control, SEER improves 0.06W/W.
(4) improve the control of compressor operating frequency accuracy
The precision that the press running frequency is controlled at present general outer automatically controlled detection is 1Hz, for improving the energy resource consumption efficiency of air-conditioner, makes compressor operation more efficient, is necessary to promote the precision of Detection & Controling compressor operating frequency.
The present invention at air-conditioner in the middle of specified during refrigeration mode, outdoor mainboard microcomputer chip, the running frequency of the compressor gone out according to detection computations and the comparative result of target frequency, control the precision of frequency-variable module with raising compressor operating frequency.Particularly, outdoor mainboard microcomputer chip calculates the cyclically-varying frequency of the operation phase current of the compressor of feedback and predetermined frequency values relatively, whether meet required precision with the running frequency that judges compressor and the difference of target frequency, when not meeting required precision, the cycle and size of the three-phase current of the direct current generator of the drive compression machine of change frequency-variable module output, thus the running frequency of change compressor is to meet required precision; Need not change the cycle and size of described three-phase current when meeting the demands.
In more detail, referring to Fig. 1: outdoor mainboard microcomputer chip is processed according in EE (data storage), writing fixed frequency after receiving indoor automatically controlled mainboard signal, send corresponding pwm control signal to frequency-variable module, this signal is after frequency-variable module is processed, by U V M three-phase phase current input compressor, compressor is according to the signal operation of appointment and detect phase current to the microcomputer chip feedback simultaneously, with the running frequency that guarantees compressor, according to target frequency, move, , make the running frequency of compressor and the difference precision between target frequency meet the requirements of precision.
Take and do not adopt the comparative example of scheme before improving that improves press running frequency precision, take of the present invention example of scheme after improving that adopts press running frequency precision, wherein, the capillary specification is all elected as under the situation of the 2.7*1.4*580 in table 1, adopted the scheme of carrying out compensated torque under specified middle refrigeration mode, and the scheme that has adopted shutoff PFC control when specified middle refrigeration or specified refrigeration mode, then tested under the experiment condition based on identical with table 1, obtained the data as following table 4.
Table 4
From the experimental data of table 4, under specified middle refrigeration mode, the precision of compressor operating frequency is brought up to 0.5Hz from 1HZ, SEER improves 0.02W/W.
Comparison sheet 1-table 4 is known, by the improvement of system matches scheme and the optimization of VFC scheme, reduce the consumed power of air-conditioner, promote the refrigerating capacity of air-conditioner, make specified refrigeration and specified middle refrigeration efficiency optimum, thereby the SEER value is brought up to 3.95W/W by 3.77W/W, and the efficiency grade rises to three grades by level Four.
On the other hand, the present invention also provides a kind of frequency-changing control system of Freon-free DC inverter air conditioner, there is outdoor mainboard microcomputer chip, this outdoor mainboard microcomputer chip, comprise: (1) turn-offs the module that PFC controls: air-conditioner in specified refrigeration or specified in the middle of during refrigeration mode, by the IGBT in the frequency-variable module of turning off air-conditioner, to turn-off the PFC control for the variable-frequency power sources of air-conditioner; (2) compensated torque module: at air-conditioner in the middle of specified during refrigeration mode, outdoor mainboard microcomputer chip calculates the rotor running position of compressor according to the operation phase current state of the compressor of feedback, and input the pwm signal with the position correction coefficient to frequency-variable module, with the dynamic torque of compensation compressor; (3) improve the module of compressor operating frequency accuracy: at air-conditioner in the middle of specified during refrigeration mode, the running frequency of the compressor gone out according to detection computations and the comparative result of target frequency, control the precision of frequency-variable module with the running frequency of raising compressor, wherein, when the difference of the running frequency of compressor and target frequency does not meet required precision, the cycle and size of the three-phase current of the direct current generator of the drive compression machine of change frequency-variable module output, thus the running frequency of change compressor is to meet required precision.
To sum up, by the scheme to the capillary group, improve, control with the PFC switch and control by external automatically controlled compensated torque, the optimization of the schemes such as raising compressor operating frequency accuracy control, reduce the consumed power of air-conditioner, promote the refrigerating capacity of air-conditioner, thereby improve the SEER value of Freon-free DC inverter air conditioner.
Further, method of the present invention and frequency-changing control system make the performance of Freon-free DC inverter air conditioner be improved, can meet with optimum system the GB requirement, not only make automatically controlled control more intelligent, and reduced the consumed power of air-conditioner, reduce raw-material use, the improving product market competitiveness.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any modification of doing, be equal to replacement, improvement etc., within all should being included in protection scope of the present invention.
Claims (7)
1. a method that improves refrigeration energy resource consumption in the season efficiency of air-conditioner, described air-conditioner is Freon-free DC inverter air conditioner, it is characterized in that,
At described air-conditioner in the middle of specified during refrigeration mode, the outdoor mainboard microcomputer chip of described air-conditioner, the rotor running position of the compressor gone out according to detection computations, the frequency-variable module of control air-conditioner compensates the dynamic torque of described compressor, and the comparative result of the running frequency of the described compressor gone out according to detection computations and target frequency, control the precision that described frequency-variable module improves the running frequency of described compressor; And
During in specified refrigeration mode, by the outdoor mainboard microcomputer chip of described air-conditioner, close the IGBT in described frequency-variable module at described air-conditioner, control with the PFC turned off for the variable-frequency power sources of described air-conditioner.
2. method according to claim 1, is characterized in that,
At described air-conditioner, in the middle of specified during refrigeration mode, the PFC that can also turn off as claimed in claim 1 for the variable-frequency power sources of described air-conditioner controls.
3. method according to claim 1, is characterized in that, the described dynamic torque to compressor compensates, and comprising:
Described outdoor mainboard microcomputer chip calculates the rotor running position of described compressor according to the operation phase current state of the described compressor of feedback, and input the pwm signal with the position correction coefficient to described frequency-variable module, thereby compensate the dynamic torque of described compressor.
4. method according to claim 1, is characterized in that, the precision of the running frequency of the described compressor of described raising comprises:
Described outdoor mainboard microcomputer chip calculates comparison by the cyclically-varying frequency of the operation phase current of the described compressor of feedback and predetermined frequency values, with the running frequency that judges compressor and the difference of target frequency, whether meets required precision; And
When the difference of the running frequency of compressor and target frequency does not meet required precision, change cycle and size of three-phase current of direct current generator of the described compressor of driving of described frequency-variable module output, thereby the running frequency that changes described compressor is to meet required precision.
5. according to the described method of any one in claim 1-4, it is characterized in that, described air-conditioner be take capillary as restricting element, and described inside diameter capillaceous is 1.4mm, and length is to be selected to be more than or equal to 550mm and the arbitrary numerical value be less than or equal in the 650mm scope.
6. method according to claim 5, is characterized in that, described length capillaceous is 580mm.
7. the frequency-changing control system of a Freon-free DC inverter air conditioner, for Freon-free DC inverter air conditioner, described frequency-changing control system has outdoor mainboard microcomputer chip, it is characterized in that, and described outdoor mainboard microcomputer chip comprises:
Turn-off the module that PFC controls: described air-conditioner in specified refrigeration or specified in the middle of during refrigeration mode, by the IGBT in the frequency-variable module of turning off described air-conditioner, with the PFC turn-offed for the variable-frequency power sources of described air-conditioner, control;
The compensated torque module: at described air-conditioner in the middle of specified during refrigeration mode, outdoor mainboard microcomputer chip calculates the rotor running position of compressor according to the operation phase current state of the described compressor of feedback, and input the pwm signal with the position correction coefficient to described frequency-variable module, to compensate the dynamic torque of described compressor;
Improve the module of compressor operating frequency accuracy: at described air-conditioner in the middle of specified during refrigeration mode, when the difference of the running frequency of described compressor and target frequency does not meet required precision, change cycle and size of three-phase current of direct current generator of the described compressor of driving of described frequency-variable module output, thereby the running frequency that changes described compressor is to meet required precision.
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| CN103884148B (en) * | 2012-12-20 | 2016-02-24 | 海尔集团公司 | The method for controlling frequency conversion of refrigerator and system |
| CN110553363B (en) * | 2019-09-03 | 2020-08-04 | 广东美的制冷设备有限公司 | Control method for air conditioner intermediate capacity, air conditioner and storage medium |
| CN111023511B (en) * | 2019-12-25 | 2021-08-24 | Tcl空调器(中山)有限公司 | Air conditioner control method, air conditioner and storage medium |
| CN114001448B (en) * | 2021-10-18 | 2023-03-14 | 广东美芝制冷设备有限公司 | Control method and device of air conditioner |
| CN114877506B (en) * | 2022-04-29 | 2023-03-24 | 美的集团股份有限公司 | Operation control method and device for air conditioner and storage medium |
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